“…Moreover, in [6], an alternative and equivalent description, more suitable for ray tracing techniques, has been developed, and, among the results, it is demonstrated that the deep-penetration effect can be achieved at the interface between two lossy media. The deep-penetration phenomenon requires an incidence angle different from 0 • , and in any case, the presence of an attenuation vector in the incidence wave constitutes a sufficient condition for a possible enhancement of the penetration in a lossy medium, i.e., even in case of normal incidence, an inhomogeneous wave may allow deeper penetration [2]. It has to be noted, by the way, that a less attenuated field does not necessarily correspond to a stronger field inside the medium, or at its surface.…”