if you still have the SLC folder with the original images, you can load your site and then run the SLC data processing module in “update” mode. in this way you will be able to plot the master area in googleearth.
Otherwise, why don’t u plot any extended results in googleearth and the get manually the footprint with a polygon? it would take less than writing these lines…
Otherwise, just for the sake to give some advanced hints, you can run the following code (from a matlab session where sarproz is running on your site):
Rg=[1 1 S S];
Az=[1 L 1 L];