I thing so that Merclover explain you well. Me I will explain you the terms:
Lamination = union of two surfaces by different processes (press, heat, glue etc.)
Delamination = apply only to alloys
Exfoliation = reverse of lamination, separation of the surfaces precedent laminated.
Your coin is clad which ask for exfoliation which is not this case. the others can explain better them the symptoms of striking or
PMD.