For the two-density square-gradient model, the tension of a non-wet interface equals (sqrt(2)/6) times the cube of one density-space side times the median distance from the third phase.
The value of the interfacial tension calculated with this expression coincides with that computed by numerical integration to high preci- sion using the full two-density model
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Three-phase equilibria in density-functional theory: interfacial tensions
For the two-density square-gradient model, the tension of a non-wet interface equals (sqrt(2)/6) times the cube of one density-space side times the median distance from the third phase.