Reflection and penetration of ap‐polarized electromagnetic wave obliquely incident on a plasma half‐space is investigated. The perturbed plasma is treated by use of the linearized relativistic Vlasov equation. Electrons are assumed to be specularly reflected from the boundary. The Laplace transform technique, recently employed by Ozizmir, is used to obtain the field solutions in the plasma. These field solutions consist of a transverse and a longitudinal part. Power reflection and transmission coefficients are also obtained.