Facet shapes in a Wulff crystal
  According to the Wulff construction the shape of the equilibrium crystal is determined by the surface tension considered as a function of the interface orientation. We present some (conjectured) approximate solutions and some rigorous results concerning this function, in the case of a lattice gas, and apply them to study the shape of the equilibrium crystal and, in particular, the shape of the facets of this crystal. 
Salvador Miracle-Sole
cond-mat.stat-mech math-ph math.MP