At first, thanks for your time!
I tried using a sampling point before at pre- and post- but both give the same results because as I said the interface layer does NOT come up at the sampling point.
regarding creating a stackup of the laminate with the interface layer and analysing it, I couldn't do that and don't know it it is possible!
At the end, I think it should be calculated manually!
but at the end thanks a lot for your time and consideration!