Top and side views of the atomic model of germanane/antimonene vdW heterostructure (2 × 2 × 1 supercells) for (a) model I, (b) model II, (c) model III, (d) model IV, (e) model V, and (f) model VI, with Δ showing in model VI denoting interlayer distance, and Sb atoms of the antimonene and Ge and H atoms being represented by purple, green, and white balls, respectively. Also 2 × 2 × 1 supercells are shown there.