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The biaxial smectic-A* (Sm-A_B*) phase, appearing in the phase sequenceSm-A*--Sm-A*_B--Sm-C*, is analyzed using Landau theory. It is found to possessa helical superstructure with a pitch that is significantly shorter than thepitch of the Sm-C* helical superstructure. The Sm-A_B*--Sm-C* transition can beeither 1st or 2nd order, and correspondingly there will be either a jump orcontinuous variation in the pitch. The behaviors of the birefringence andelectroclinic effect are analyzed and found to be similar to those of aSm-C*_alpha phase. As such, it is possible that the Sm-A_B* phase could bemisidentified as a Sm-C*alpha phase. Ways to distinguish the two phases arediscussed.

The Biaxial Smectic-A* Phase -- A New Phase, Already But Unknowingly Discovered?