I read the OP's question like this.  Suppose you had an SATB score with two staves and layers assigned S/A -> 1/2 and T/B -> 1/2.  How can I explode S/A into two separate staves without layers, S -> staff 1, A -> staff 2, and similarly with the T/B, ending up with 4 staves without layers.  I'm using this as an example.  I know the OP said only two layers, but the principle is the same.

The proposed method of using "Manage Parts" would certainly generate the "parts" but they would not be separate staves on the same part, which is what I took the question to be.  The parts could then be copy/pasted into another set of staves.  I don't see plugin or utility that will do it.  One way to do it manually would be to create the four empty staves in the original document and use the "Show Active Layer Only" option in the Document menu in conjunction with selecting each layer one at a time.  You could then select the original staff with the layer showing and copy/paste it into the appropriate newly created blank staff.  Then delete the original layered staves.  This process could "probably" be automated with Finalescript.  Sounds like a fun project, if this is what the OP wanted.

Post Edited (Charles Lawrence) : 12/12/2012 3:38:48 PM (GMT-6)

Zuill,

I believe that is just the method I outlined.

Post Edited (Maharal) : 12/13/2012 5:21:53 AM (GMT-6)