Scatterer on Substrate

Hi,

In the scatter on substrate example application (https://www.comsol.com/model/scatterer-on-substrate-14699), two ewfd physics are used, one for calculating the background field, followed by another one for studying the scattering field.

I'm wondering if there is a way that we can use only one step in the simulation, meaning calculating the full field directly, instead of doing a two-step simulation?

Thank you!