issue contents
May 2019 issue
![Highlighted illustration](/a/issues/2019/03/00/graphics/coverill.gif)
Cover illustration: -Cu2-xSe has extraordinary thermoelectric properties, but the structure has remained elusive since 1936. Using the three-dimensional difference pair distribution function (3D-
PDF), which is a generalized Patterson function, the locally ordered structure in disordered Cu2-xSe can be solved by hand.
-Cu2-xSe is built from perfectly ordered two-dimensional layers with a highly disordered stacking sequence. For a century crystallography has focused on crystalline order; now the 3D-
PDF provides a basis for developing the `crystallography of disorder' [Roth & Iversen (2019). Acta Cryst. A75, 465-473].
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