An exactly solvable model of an interface between coexisting phases in a modified planar lattice gas, or its magnetic equivalent, is described. The results reconcile the apparent conflict between intrinsic structure and capillary fluctuation theory. There are anomalously long-ranged correlations in the interface.

• Received 2 February 1981

DOI:https://doi.org/10.1103/PhysRevLett.47.545