Figure 2. (a) Relaxed atomic configuration of silicene on bulk MoS2 (side view). In (b) the STM image (VB=0.2V, IS=2nA) of a partially covered MoS2 surface by Si atoms is shown (right side). A line profile taken across the two terraces allows measuring the amplitude of the step which amounts to about 5 ? (left side of b). In (c) and (d), the top view of a and c configurations from Fig. 1 (obtained after atomic relaxation) are shown. Blue, yellow and green spheres are Si, S and Mo atoms, respectively. The experimental results are from ref. 14.