| http://www.w3.org/ns/prov#value | - The sublayers having a relatively high acoustic impedance may be composed of an elemental metal selected from (a) Pt, Ir, Pd, Rh, Au, Ni, and Cu; or an alloy principally containing at least one metal selected from (b) Pt, Ir, Pd, Rh, Au, Ni, and Cu.
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