The density distributions of the head part, ϕ_h, of the (30/70) amphiphiles, corresponding to different parameters in Fig. 1(b), for (a) f = 0.24, L = 16, (b) f = 0.1, L = 12, and (c) f = 0.1, L = 60. The white squares schematically denote the square-shaped particle with different sizes.