This proposal is part of a major EPSRC (EP/GR065705)/Unilever funded programme to develop and control the spontaneous formation of surfactant multilayer structures at interfaces; a potentially important structural motif for a wide range of technological applications. The use of multivalent counterions and varying surfactant structure using the Sodium alkyl oxyethylene sulfates is one of the promising areas being pursued, and we are currently exploring their surface properties. However, to fully understand their surface self-assembly it is vital that the complementary bulk structures are characterised and understood, and we request SANS beam time on SANS2D to make such measurements.