The stacking-fault energy of high-purity vapor-grown crystals was deduced using dislocation node measurements. The fault energy was between 100 and 150mJ/m2.

Stacking Fault Energy and Polygonization in Vapor Grown CdS. B.N.Das, M.Weinstein, A.A.Menna: Materials Research Bulletin, 1970, 5[10], 751-8