Fig. 2: Optical microscopy images of the 20 kinds of as-synthesized 2D AMX2 compounds.
From: General synthesis of ionic-electronic coupled two-dimensional materials

a Summary of 2D AMX2 compounds that can be synthesized using this method. Orange, element A; yellow, element M; green, element X. b Optical images of the as-synthesized 2D AMX2 nanosheets.