An ordering phase transition is characterized by a loss of symmetry: the ordered phase has less symmetry that the disordered one. Hence, an ordering process leads to the coexistence of different domains of the smae ordered phase. An interface forms whenever two such domains contact. The thermodynamic behavior of this interface is governed by different forces. The presence of the underlying lattice and the stability of the ordered domains tend to localize the interface and to reduce its width. On the other hand, thermal fluctuations favor an interfacial wandering and an increase of the interface width. The result of this competition depends strongly on the order of the bulk phase transition.
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