Density profiles at a planar liquid-liquid interface

Molecular dynamics of liquid-liquid interface in an immiscible binary mixture of simple particles at low temperature and high pressure reveals stable equilibrium oscillatory structures in the density profiles of both components. The layering vanishes albeit slowly with the increase of the surface area but is not affected by an increase of the depths of bulk liquid layers. A simple Gaussian broadening predicts scaling of the oscillatory portion of the density profiles and good agreement is found. The width of the dip in the total density is also examined.