Extended Data Fig. 3 | Molecular dynamics simulation. a, b, Side view (a) and
top view (b) of a-BN grown on Si substrates at 673 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.