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On the refraction and reflection properties of symmetric and asymmetric electromagnetic beams

We analyze the propagation properties of 2D electromagnetic beams related to the symmetry of the electric field on their waist. We find conditions under which they can be adequately represented by the propagation of a single planewave component; we also exhibit examples where this is not so, and, thus, care has to be taken when using refraction and reflection laws to determine the refraction and reflection angles of a beam.