Figure 1
From: Silicene oxides: formation, structures and electronic properties

Optimized structures of (a) silicene and silicene oxides with (b) Oqb, (c) Odb, (d)
, (e)
, (f) OHtl, (g) OHul, (h) OHbl and (i) OHal.
Both top and side views of the structures are shown. The unit cell of each structure is indicated by a rhombus or rectangle. Si, O and H atoms are denoted by green, red and grey balls, respectively.