Stacking-fault energies of various metals were deduced from X-ray measurements of line profiles. The stacking-fault energy of Al-1%Cu was 155mJ/m2. It was found that the energy was not greatly affected by deformation.

X-Ray Determination of Stacking Fault Energies in Cu-Ni, Cu-Zn and Cu-Al Alloys. B.K.Mathur, B.K.Samantaray, G.B.Mitra: Indian Journal of Pure and Applied Physics, 1981, 19[3], 277-8