X-ray scattering techniques are increasingly used for the study of liquid s
urfaces and interfaces. We give here scattering cross-sections for diffract
ion or diffuse scattering from liquid interfaces and we discuss the example
s of the liquid-vapour interface and of films at a liquid-liquid interface.
We show that the interfacial structure can be understood as resulting of t
he interplay between thermal fluctuations, van der Waals forces, and elasti
c properties. (C) 2001 Elsevier Science B.V. All rights reserved.