The structure of the alkali-metal-induced reconstructed Cu(110)-(1 x 2) surface was analyzed by use of low-energy electron diffraction. A missing-row model, a row-pairing model, and a saw-tooth model have all been examined. The results confirm the missing-row model for the reconstruction with no long-range order for the alkali-metal atoms. The top interlayer spacing of the reconstructed Cu(110) surface was contracted by 11% and the second layer exhibited a lateral pairing displacement of 0.10Å.

Structure Analysis of the Cu(110)-(1 x 2) Surface Reconstruction Induced by Alkali-Metal Adsorption. Z.P.Hu, B.C.Pan, W.C.Fan, A.Ignatiev: Physical Review B, 1990, 41, 9692-6