Comment on “Systematic approach to generate near-perfect periodic continuous random network models: Application to amorphous ${\mathrm{Si}}_3{\mathrm{N}}_4$”

Ouyang and Ching [Phys. Rev. B 54, R15 594 (1996)] have recently proposed a very elegant algorithm for building amorphous networks. Their algorithm, though, leaves strong remnants of cubic symmetry and cannot provide satisfactory amorphous models.