The recent discoveries of silicene, germanene, and stanene, commonly denoted as Xenes (with X being Si, Ge, Sn), and their ligand-functionalized “Xane” derivatives, brings to the forefront an important class of two-dimensional (2D) elementary crystals. Similar to graphene, these materials are comprised of group IV atoms arranged in a honeycomb lattice, but with varying degrees of buckling that inherently stem from the interplay of sp 2 and sp 3 hybrid bonds. So far, Xenes were synthesized as epitaxially grown monolayers ...