Plaxis Output commands: How to create a Interface plot?

I have a Plaxis Python workflow to export some pictures showing plastic point and stresses. However, when attempting to export relative shear stress on an interface (1 out of 6 interfaces) I'm stuck in the creation of the interface plot. 

When doing this manually I double-click on the Interface I want and the change the result type to relative shear stress. How can I create an interface plot using command line or Python? (Once created I'm able to change result type and export)