Multilayer relaxation of clean Ag{001}

A low-energy electron-diffraction intensity analysis of data from a clean Ag{001} surface finds no multilayer relaxation, i.e., with dik being the change in spacing between layer i and layer k, d12=0±0.03 and d23=0±0.03. These results are compared with the results of first-principles total-energy calculations and with other recent relaxation determinations on fcc {001} surfaces. © 1991 The American Physical Society.