Abstract
The theme of this lecture is concerned with the change in behaviour of simple molecules which occurs when such molecules are incorporated into assembled or self-assembled mono-and multilayers on surfaces. The area is one of wide technological importance because of potential application in, for examples, photoresists, piezo and pyroelectric devices, and multiple harmonic oscillators1. Behaviour of assembled molecules is also significant because of the nature of lipid bilayer cell membranes and their behaviour is, of course, of front-line importance in connection with matters such as inherent stability and penetration by drugs and so on. This account is concentrated upon events at the molecular level and the emphasis is on the relationship between structure and selectivity.