Residual Interface Strength for User Defined Soil Models

Hi,

Is there a way to be able to input or indicate a Residual Interface Strength at the interface of a structure and soil that is assigned with a User defined soil model? UDSM seem to have a different set of interface parameters where we input the strength and deformation properties making then not reliant on the adjacent soil. I'm just interested on assigning a different set of strength and deformation parameters at the interface and specifically assigning a residual interface strength. 

Thanks!