Premelting-Induced Smoothening of the Ice-Vapor Interface
  We perform computer simulations of the quasiliquid layer of ice formed at the ice-vapor interface close to the ice Ih-liquid-vapor triple point of water. Our study shows that the two distinct surfaces bounding the film behave at small wavelengths as atomically rough and independent ice-water and water-vapor interfaces. For long wavelengths, however, the two surfaces couple, large scale parallel fluctuations are inhibited, and the ice-vapor interface becomes smooth. Our results could help explain the complex morphology of ice crystallites. 
Jorge Benet, Pablo Llombart, Eduardo Sanz, and Luis G. MacDowell
cond-mat.soft cond-mat.mes-hall cond-mat.stat-mech