This book deals with the application of grazing angle x-rayand neutron scattering to the study of surface-inducedcritical phenomena. With the advent of even more advancedsynchrotron radiation sources and new sophisticatedinstrumentation this novel technique is expected toexperience a boom.The comprehensive and detailed presentation of theoreticaland experimental aspects of the scattering of evanascentx-ray and neutron waves inside a solid makes this bookparticularly useful for tutorial courses.Particular emphasis is put on the use of this technique toextract microscopic information (correlation functions) fromthe real structure of a surface, from buried and magneticinterfaces and from surface roughness.