4-channel audio channel layout

Hey hey,
I am working on a quadraphonic piece, to be reproduced in a concert venue. I 
have searched the web and some of my local tools which support 4-channel 
processing, but couldn't find any answer, if there are standard 
layouts/mappings to store four channels in a file.

Does any have an idea or perhaps a keyword that might put my search in the 
right direction?

To be more precise: I have four speaker channels, which should be front left, 
front right, rear left and rear right. From the relevant documentation 
ambisonic formats are not accepted.

Best wishes,

Jeanette

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