[AaronJayThomas]

There is a Complex of Mo, overall positive 1 charge. It has 4 ligands, 2 of which are Cp- rings, 1 is H- and the final is ethene.

I can't find the name of the complex, so I'm posting here.

Would ligand field theory, and spectrochemical series predict the complex to be tetrahedral or square planar?
I think square planar. What do you think?

[AWK]

Do you mean
[(η⁵-Cp)₂Mo(η²-C₂H₄)H]⁺ PF₆^-