Structure of Ag{410}

A quantitative low-energy electron diffraction (QLEED) analysis of data col lected from a clean Ag{410} surface finds no relaxation of the first interl ayer spacing, 36% compression of the second interlayer spacing and 18% expa nsion of the third interlayer spacing with respect to the bulk value (0.498 Angstrom). The Ag{410} surface is a stepped surface with the smallest inte rlayer spacing analyzed so far by QLEED with the computer program CHANGE. S ome difficulties in the analysis are discussed.