Physical description of a real liquid interface

We have already seen that the boundary region between two bulk phases has a thickness, Ax. Usually in the liquid-vapor and some liquid —liquid2 interfaces the boundary layers are 

The differences between interfacial and bulk molecular interaction energies are due mainly to the two-dimensional geometry of the surface and also to differences in interfacial structure and differences in magnitude of the molecular interactions at the interface, from those of the bulk. In principle, it would be possible to calculate the energy of cohesion between molecules within a single phase if the potential energy functions and the spatial distributions of all the atoms and molecules were known. Moreover, if the complete 

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