Moreover, the energetically similar but unstable bridge site already allows the prediction of a low terrace self-diffusion barrier. At this point, we refer to the work of Lautar et al. in which potential energy surfaces (PES) were calculated, clearly showing the varying energy landscapes for Mg(0001), Mg(101 ! 0)A, and Mg(101 ! 1). We also want to reference two EAM potentials for magnesium by Liu et al. and Sun et al. However, in the potential of Liu et al., only the bridge position on Mg(0001) is stable, which is not the case according to our DFT calculations. We also want to point to the section Diffusion barriers, which further clarifies why fcc sites are energetically favored over hcp sites, although this contradicts the nature of the hcp lattice, which should follow the ABABAB-stacking sequence.