This proposal is part of a funded (CASE) project, aimed at understanding the delivery of benefit actives (perfumes) to interfaces and the development of new self-assembled structures for more optimal interfacial delivery and retention. We have previously made good progress in characterising, using NR, and understanding the co-adsorption at the air-water interface of the anionic surfactant LAS with 2 synthetic perfumes of differing degrees of hydrophobicity (phenyl ethanol and linalool). We now wish to extend those measurements to different anionic surfactants, where preliminary measurements indicate a strong surface interaction between SDS and perfume. We request 5 days of NR beam time on SURF / INTER to pursue this aspect of the project, in order to understand the nature of this interaction and provide the route to exploiting this exciting and significant development.