We will use time-resolved specular neutron reflectivity measurements to follow the in-situ growth of polymer brushes by surface-initiated ATRP. This will enable us to determine the segment density distribution during growth and so determine if growth proceeds in a swollen or collapsed state. This growth mode has implications for the way in which the prepared brushes respond to environmental stimuli. We will also use time-resolved measurements to observe how the combined surfactant and polymer density distribution evolves as surfactant multilayer structures grow inside the brush. Having assembled these structures we will then follow the salt-induced disassembly. The modes of growth and disassembly and the corresponding kinetics will be related to the nature of the aggregates (discrete micelles or extended lamellae).