Limitations in the structural determination of a close-packed overlayer

Abstract

The close-packed metal overlayer system c(10 × 2)Ag/Cu(001) has been the subject of extensive electronic structure studies. These include the examination of the two-dimensional behavior at low coverages, the development from two- to three-dimensionality, and the convergence to three-dimensional dispersion as in Ag(111). It would be of use to have a firmer picture of the placement of the first monolayer Ag atoms (d┴) versus the Cu(001) substrate. However, it will be demonstrated with FEFF that there are fundamental limitations to the extraction of that information with photon-induced electron diffraction.