The formation of the banded textures evolved in the liquid crystalline solution of poly(gamma -benzyl L-glutamate), PBLG, when an alternating electric field applied parallel to glass surfaces (in-plane), was investigated. The director rotation in the band appeared as regular stripes perpendicular to the field direction was analyzed by using polarizing microscope and measuring the light intensity under crossed polarizers. The detailed map of directors in the area of band was performed.