 Later they showed that the structure of (see Figure 2) is the smallest boron cluster to have sixfold symmetry and a perfect hexagonal vacancy, and that it can serve as a potential basis for extended two-dimensional boron sheets.After the synthesis of silicene, multiple groups predicted that borophene could potentially be realized with the support of a metal surface.In particular, the lattice structure of borophene was shown to depend on the metal surface, displaying a disconnect from that in a freestanding state.