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We study theoretically the smectic A to C phase transition in isotropicdisordered environments. Surprisingly, we find that, as in the clean smectic Ato C phase transition, smectic layer fluctuations do not affect the nature ofthe transition, in spite of the fact that they are much stronger in thepresence of the disorder. As a result, we find that the universality class ofthe transition is that of the "Random field XY model" (RFXY).

The Smectic A to C Phase Transition in Isotropic Disordered Environments