[Freesurfer] Creating intermediate surfaces between white and pial?

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Dear FreeSurfer experts,

I know that I can sample data from a certain depth between the white and pial surfaces, but is there any way to create an intermediate surface file (i.e., mesh)?

I would like to create, e.g., a surface file that is at 10% of the distance between the white and pial surface.

I had a look at mris_create_surface, but unless I misinterpreted the description of the command line arguments, it does not seem to be the proper tool for the job.

Background: This is for visualization purposes. I would like to create a figure similar to Figure S1 from Bletsch et al. 2018 in tkmedit: https://onlinelibrary.wiley.com/action/downloadSupplement?doi=10.1002%2Fhbm....

Thanks for your time and all the best,

Tim

-- Dr. Tim Schäfer Postdoc Computational Neuroimaging Department of Child and Adolescent Psychiatry, Psychosomatics and Psychotherapy University Hospital Frankfurt, Goethe University Frankfurt am Main, Germany