Figure 4: Relationship between B 36 and borophene.
From: Planar hexagonal B36 as a potential basis for extended single-atom layer boron sheets

A schematic view of part of an extended one-atom-thick boron sheet, named borophene, as constructed from the planar hexagonal B36 unit. The circles represent the apex atoms in the B36 unit that are shared by three units. Removal of these atoms would lead to the α-sheet8.