It was recalled that Ong & Chan (1989) had examined 7 different asymmetrical dimer reconstructions for a Si(100) surface using the complete neglect of differential overlap method. The p(4 x 1) and c(4 x 2) reconstructions were found to be energetically more favourable, followed by p(2 x 2) and (2 x 1). Zandvliet comments only on the results of the four members of the (2 x 1) family, since experimentally the other asymmetric dimer reconstructions were not observed on the Si(100) and the Ge(100) surfaces.

Comment on 'Surface Reconstruction on Si(100) Studied by the CNDO Method’. H.J.W.Zandvliet: Journal of Physics - Condensed Matter, 1989, 1[51], 10603-4