| http://www.w3.org/ns/prov#value | - The second conductive layer 108 may be made of a metal element that is selected from the group consisting of tantalum (Ta), titanium (Ti), molybdenum (Mo) and tungsten (W), an alloy including one of these elements as its main ingredient, or an alloy including at least two of these elements (such as an Mo???W alloy or an Mo???Ta alloy).
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