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We discuss orientational order in two dimensions in the context of systemswith competing isotropic interactions at different scales. We consider anextension of the Brazovskii model for stripe phases including explicitlyquartic terms with nematic symmetry in the energy. We show that leadingfluctuations of the mean field nematic solution drive the isotropic-nematictransition into the Kosterlitz-Thouless universality class, i.e. these systemshave a thermodynamic phase with orientational quasi-long-range order.

Orientational order in two dimensions from competing interactions at different scales