| http://www.w3.org/ns/prov#value | - Preferred metallocenes include those represented by the formula: TCpCpMX2, where T is a bridging group such as a dialkyl silica group (such as dimethylsilyl) or a hydrocarbyl group (such as methyl, ethyl, or propyl), each Cp is, independently a substituted or unsubstituted cyclopentadienyl group, a substituted or unsubstituted indenyl group (preferably a 2,4 or 2, 4, 7 substituted indenyl group),
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