Perfect absorption at Zenneck wave to plane wave transition

We theoretically demonstrate that there is an angle of incidence and frequency at which a p-polarized electromagnetic wave can be perfectly absorbed without reflection by a half-space of lossy indefinite anisotropic medium. We show that this perfect absorption occurs when the Zenneck wave guided by a surface of indefinite medium transits to a homogenous plane wave. This angular and frequency selectivity of the absorption can find a use for photovoltaic systems.