The physical effect of this it is: When you strike, the forces are from the center to outside. If you strike trough debris, are mean you will have high percentage of vibration on that part of the object. In our case is a clad coin so the vibrations which are internal to the material could go to the exfoliation of the clad foil.
Maybe to short explanation and to physically
PS For numismatic I will say struck through debris and exfoliation.
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