  The contrasting melting behavior of different surface orientations in metals
can be explained in terms of a repulsive or attractive effective interaction
between the solid-liquid and the liquid-vapor interface. We show how a crucial
part of this interaction originates from the layering effects near the liquid
metal surface. Its sign depends on the relative tuning of layering oscillations
to the crystal interplanar spacing, thus explaining the orientational
dependence. Molecular dynamics recrystallization simulations of Au surfaces
provide direct and quantitative evidence of this phenomenon.
