Covariant D and H fields for reflection from a magnetic anisotropic chiral medium

Difficulties have previously been noted in the use of the D and H fields in the Maxwell boundary conditions when these are applied to theories of reflection effects involving chiral media. Such difficulties may be avoided by adopting covariant forms of D and H. These are derived in the electric quadrupole–magnetic dipole approximation for a magnetic anisotropic chiral medium exposed to a plane monochromatic electromagnetic wave.