MISFIT DISLOCATION-STRUCTURE FOR CLOSE-PACKED METAL-METAL INTERFACES

We describe theoretical calculations applying a 2D Frenkel-Kontorova ( FK) model to the heteroepitaxial system Cu on Ru(1000). The experiment ally observed variation of structure with layer thickness is simulated by scaling the adatom-adatom interaction. The minimum energy configur ations are in exceptional agreement with recent scanning tunneling mic roscopy results showing four distinct structures as a function of thic kness. These metal on metal films present a new realization of the FK model which complements previous investigations of rare gas adsorption on graphite.