As I've learned from Brian they come over the top because they have an open face.
They cock rt wrist instead of bend .
Then they try pull rt elbow in with a rt palm skyward ------only one thing to do from there--------over the top.
Twist away then twist away some more!
I like a two piece takeaway, which most golfers call the one piece takeaway.. a slight bending of the flat right wrist as shoulders pivot away ( as Brian said ) keeps the clubface square for a small distance before the right wrist completes its fold back to the top.
I see Els and Furyk two piece away with the right wrist as I discribed, check out some pics of them in GD.