TRANSITION TO MULTILAYER KINETIC ROUGHENING FOR METAL (100) HOMOEPITAXY

A model for metal (100) homoepitaxy is developed which describes irrev ersible submonolayer nucleation and growth of 2D square islands, and t he subsequent transition to multilayer growth. Roughness is sensitive to the additional barrier to descend a step, which is estimated for Fe /Fe(100). We find oscillatory height-height correlations and non-Gauss ian height and height-difference distributions, necessitating refineme nt of existing diffraction theory. We predict the disappearance of a d iffraction ring during growth, and a nonmonotonic variation of roughne ss with temperature.