Negative reflection in absorbing uniaxial media. Rutile TiO2

We study the negative reflection of the extraordinary wave inside a slab of an uniaxial anisotropic absorbing material placed between two isotropic materials. The optic axis is contained in the plane of incidence. We particularize for Rutile TiO2 that possesses a high refractive index that makes it suitable for many applications. We show the existence of negative reflection in the ray and study its dependence with the orientation of the optic axis. We also compute the limiting angle for the occurrence of this phenomenon. It is found that negative reflection occurs for almost all values of the angle of incidence.