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Smectic Layer Rotation in Ferroelectric Liquid Crystals

The smectic layer rotation in ferroelectric liquid crystals has been observed by applying an asymmetric waveform of electric field using both a rubbed cell and a nontreated cell. The rotation angle increases exceeding the tilt angle with increasing cycles of applied voltage. The direction of the smectic layer rotation depends on the sign of spontaneous polarization. The layer rotation should be a common phenomenon in ferroelectric and antiferroelectric liquid crystals.