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+\documentclass[a4paper]{letter}
+
+\usepackage[utf8]{inputenc} % why not type "Bézout" with unicode?
+\usepackage[T1]{fontenc} % vector fonts plz
+\usepackage{newtxtext,newtxmath} % Times for PR
+\usepackage[
+  colorlinks=true,
+  urlcolor=purple,
+  linkcolor=black,
+  citecolor=black,
+  filecolor=black
+]{hyperref} % ref and cite links with pretty colors
+\usepackage{xcolor}
+\usepackage[style=phys]{biblatex}
+
+\addbibresource{bezout.bib}
+
+\signature{
+  \vspace{-6\medskipamount}
+  \smallskip
+  Jaron Kent-Dobias \& Jorge Kurchan
+}
+
+\address{
+  Laboratoire de Physique\\
+  Ecole Normale Sup\'erieure\\
+  24 rue Lhomond\\ 
+  75005 Paris
+}
+
+\begin{document}
+\begin{letter}{
+  Editorial Office\\
+  Physical Review Letters\\
+  1 Research Road\\
+  Ridge, NY 11961
+}
+
+\opening{To the editors of Physical Review,}
+
+The subject of `complex landscapes,' which started in the spin-glass
+literature, is concerned with functions (landscapes) of many variables having
+a multiplicity of minima. Apart from its obvious relevance to glassy systems,
+it has found applications in many domains: computer science, ecology,
+economics, and biology, to name a few.  \footfullcite{Mezard_2009_Information}
+
+Recently, interest has developed in landscapes for which the variables are
+complex. There are several reasons for this: in computational physics the
+`sign problem' is a major obstacle, and a strategy has emerged to attack it by
+deforming the sampling space into complex variables.  This is a most natural
+and promising path, and any progress made will have game-changing impact in
+solid state physics and lattice QCD.  \footfullcite{Cristoforetti_2012_New,
+Scorzato_2016_The} At a more basic level, following the seminal work of
+E.~Witten, \footfullcite{Witten_2010_A, Witten_2011_Analytic} there has been a
+flurry of activity concerning the very definition of quantum mechanics, which
+also requires that one move into the complex plane. 
+
+In these cases, just as in the real case, one needs to understand the structure
+of the `landscape,' like the location of saddle points, how they are connected,
+and typical questions of `complexity.'  However, to the best of our knowledge,
+there are no studies extending the methods of the theory of complexity to
+complex variables.  We believe our paper will open a field that may find
+numerous applications and will widen our theoretical view of complexity in
+general. Our manuscript has been amended to emphasize these important connections with other areas of physics.
+
+\closing{Sincerely,}
+
+\vspace{1em}
+
+\end{letter}
+
+\end{document}