The Smectic A to C Phase Transition in Isotropic Disordered Environments
  We study theoretically the smectic A to C phase transition in isotropic disordered environments. Surprisingly, we find that, as in the clean smectic A to C phase transition, smectic layer fluctuations do not affect the nature of the transition, in spite of the fact that they are much stronger in the presence of the disorder. As a result, we find that the universality class of the transition is that of the "Random field XY model" (RFXY). 
Leiming Chen and John Toner
cond-mat.soft cond-mat.stat-mech