Spherical micelles with Nagg ≥ 107 show a multi-domain structure, similar to collapsed vesicles. This is shown in Figure and f and by the corresponding RDFs (SI, Figure ), where a high density of shell beads is present in the centre of the assembly, followed by a central layer of core beads and an outer layer of shell beads. A similar situation is observed in some of the prolate/dumbbell assemblies, where we observe the intrusion of hydrophilic beads into the central region of the micelle (Figure ; SI, Figure ).