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Substrate strain mediated adatom density distributions have been calculatedfor Cu<111> surfaces. Complemented by Monte Carlo calculations a hexagonalclose packaged adatom superlattice in a coverage range up to 0.045 ML isderived. Conditions for the stability of the superlattice against nucleationand degradation are analyzed using simple neighborhood models. Such models arealso used to investigate the dynamic of adatoms within their superlatticeneighborhood. Collective modes of adatom diffusion are proposed from theanalogy with bulk lattice dynamics and methods for measurement are suggested.The explanation of surface state mediated interactions for superstructuresfound in scanning tunnelling microscopy experiments is put in question.

Stability and Dynamic of strain mediated Adatom Superlattices on Cu<111>