Extended Data Fig. 3: Molecular dynamics simulation.
a, b, Side view (a) and top view (b) of a-BN grown on Si substrates at 673Â K, calculated using molecular dynamics simulations. Different atomic species are shown in different colours: yellow (Si), blue (N) and pink (B). c, Mass density profile along the transverse direction (z), obtained from the results shown in a and b. Coloured solid lines denote the densities of different chemical species. The simulated density of a-BN is consistent with the experimental result. The black dashed line corresponds to the measured BN mass density.
