Significance of the bulk correlation length for wetting transitions

Abstract
Second-order and multicritical wetting transitions do not depend on the smooth variation of interfacial density profiles on the scale of the bulk correlation length. This independence is surprising, because on the other hand, wetting transitions turn out to be affected so delicately by the details of a specific system, that, for example, lattice-gas models fail to predict quantitatively the order of the transition in case it is first order or multicritical.