Valerie,

If the application is high frequency, then your customer may be more
interested in the plating material.  As signal frequency increases, the signal
concentrates less and less in the center of the conductor and moves to the
surface of the conductor.  The amount of penetration in to the conductor is
called the skin depth and is a function of frequency,  permeability of the
conductor, and resistivity of the conductor.

To sum it up, at high enough frequencies, the plating may become the dominant
conductor.

Good luck,

Frank

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