  Numerical examination of the solution of the boundary--value problem of the
reflection and transmission of a plane wave due to a slab of an electro--optic
structurally chiral material (SCM) indicates that the exhibition of the
circular Bragg phenomenon by the SCM can be controlled not only by the sign and
the magnitude of a dc electric field but also by its orientation in relation to
axis of helicoidal nonhomogeneity of the SCM. Thereby, the possibility of
electrical control of circular--polarization filters has been extended.
