Which method suits your sample?

Direction and geometry decide more than material does — asking for a cross-plane number changes the answer entirely, not just the caveat. Answer five questions and this narrows the field.

This simplified model routes on geometry, scale, electrical behavior, direction and operating condition. Real method selection also weighs expected property range, available specimen length, whether coating or transfer is permitted, destructiveness and how many specimens you can spare — which is why the suggestion below is a starting point for a conversation, not a specification.