The formation of multilayer structures at surfaces and interfaces from self-assembly in mixed surfactant and in polymer / surfactant mixtures has been recently reported, and they are being increasingly recognised as an important structural signature associated with a wide range of technological applications and biological function. Their potential applications in detergency and many aspects of soft lubrication (hair and fabric conditioners) and biolubrication are receiving much current interest. We (Oxford, STFC, Unilever) now have a major theoretical and experimental programme in this area (with EPSRC funding for 2 students and a PDRA to work on the experimental and theoretical aspects). We request beam time to continue from the intial allocation on INTER to probe the kinetics of surfactant multilayer formation and dissolution at the air-water interface.