Fig. 1: Chemical and coordination space.
From: Pettifor maps of complex ternary two-dimensional transition metal sulfides

a Periodic table showing the elements selected. TM boxes are coloured according to the MX2 2D GS prototype, as reported in Fig. 2. Grey boxes indicate non-layered, 3D ground-state TMDs. Sulfur is highlighted in yellow while the other calchogenides are in orange. b–i The sides and top views of the eight MX2 prototypes. The space group of each prototype is reported in Supplementary Table III.