|Surfaces and interfaces in quasi-periodic systems - such as incommensurate crystals and ideal quasicrystals - feel effective, quasi-periodic potentials. These potentials, which are characterized by an irrational ratio of two periodicities, reduce both the interfacial roughness    and the divergencies at wetting transitions  as found in periodic systems. Random quasicrystals, on the other hand, lead to random interface potentials that act to increase the interfacial roughness. |
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