Hi,

I sent you a png file in the attachment, you can see your example's explaining there. h isthickness, d is depth of the lower boundary of the sheet to the surface. about how the inversion work: you can find many 1D inversion studies : you can find here, one of these studies

Article Automatic 1D interpretation of DC resistivity sounding data

,

if you could not reach or dont understand mathematic of 1D inversion you can send me private message

Sorry for the late reply

I attach you a profile that shows the depth and thickness calculation

https://www.researchgate.net/publication/26560586_A_Damped_Least-Squares_Inversion_Program_for_the_Interpretation_of_Schlumberger_Sounding_Curves may be a good start

https://www.researchgate.net/publication/26560586_A_Damped_Least-Squares_Inversion_Program_for_the_Interpretation_of_Schlumberger_Sounding_Curves

You make go through this article