Abstract
Interlayer interaction in the ferroelectric and antiferroelectric smectic phases is developed taking into account the distribution of dipole moment in molecule of liquid crystal. A very important role is played by mutual dislocation of different fragments of molecules inside smectic layer and it plays the key role in dipole-dipole interaction between neighbouring layers. Tilt of molecules in the smectic layer is followed from the ordering of the dipole moments in one direction of one layer. Three ordered phases are found, first is synclinic, second is anticlinic and third is twisted structure. In twisted structure the angle between two layers is 90 degree.
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