At small angles, degenerates into a dislocation wall;
at large angles, degenerates into deGennes' curvature wall.
Surface anchoring and filing the space with FCDs: O.D. Lavrentovich,
JETP (1986).
FCDs set a faceted structure of a spherical smectic dropl the bases of the FCD provide tangential director orientation while the gaps have perpendicular orientation; the smallest size of the FCD is determined by the balance of the elastic and surface forces.