Mesh study external aerodynamics problem

Hello,
I made some changes in the layers refinement and acquired a better mesh. I am in doubt about a layer parameter.
I found this forum Boundary layer inflation thickness - #4 by AnetaNovak and it was not clear for me if what parameter is the “final layer thickness”. On this forum there is also a “first layer thickness” parameter that not appear in my simulation.
I uploaded this draw of a boundary layer, to show my question, the parameter “final layer thickness” is the A or B? Is it possible to choose between using the “final layer thickness” or “first layer thickness”, I did not understand if it is the same also.