General schema for the Brewster conditions

A matrix-based treatment of planewave reflection at general bimaterial interfaces has been used to obtain the Brewster conditions for the planar interface of two Lorentz-covariant media. There are two such conditions obtained, one for each half-space containing the incident planewave; this is remarkable since both Brewster conditions have turned out to be identical for all of the specific bimaterial interfaces examined in the past