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A piezoelectric mechanism of orientation of stripes in two-dimensionalquantum Hall systems in GaAs heterostructures is considered. The anisotropy ofthe elastic moduli and the boundary of the sample are taken into account. It isfound that in the average the stripes line up with the [110] axis. In doublelayer systems the wave vector of the stripe structure rotates from the [110] to[100] axis if the period of density modulation becomes large than theinterlayer distance. From the experimental point of view it means that indouble layer systems anisotropic part of resistivity changes its sign undervariation of the external magnetic field.Comment: 8 page

Piezoelectric mechanism for the orientation of stripe structures in two-dimensional electron systems