The book "Theory of Reflection" by John Lekner offers a comprehensive analysis of the reflection of electromagnetic and particle waves at various interfaces. It addresses both sharp and diffuse interfaces and covers a wide range of topics, including absorption, inverse problems, anisotropy, pulse shapes, finite beams, rough surfaces, as well as numerical and matrix methods. The second edition is an updated and expanded version of the original monograph from 1987 and includes new chapters on periodically layered media, ellipsometry, chiral media, neutron reflection, and the reflection of acoustic waves. Notably, the expanded chapter on anisotropy provides an in-depth treatment of the reflection and transmission properties of arbitrarily oriented uniaxial crystals. The book is aimed at physicists, chemists, applied mathematicians, and engineers, and is written in a clear, direct style, with all necessary mathematical concepts explained in the text.