When you do a 13X9 cake - do you usually tort one cake mix, or bake a second 13x9 cake and use that as the second layer?
I use 1 1/2 mixes and just do a 2" layer. If someone wants it filled then it will be a two layer cake. I don't torte sheet cakes. Too much of a PITA for me! 
I'd say it depends on how many servings you need.
A single layer (2" tall) 9x13 that is torted is STILL just a 2" tall cake with some icing in the middle. Pieces would be cut in 2x2x2" squares and yield approx 24 pieces.
A double layer (two 2" tall cakes stacked on top of each other with icing/filling between them) is a 4" tall cake. Pieces would be cut in 1x2x4" pieces and yield approx 48 pieces.
In my neck of the woods, single layer sheet cakes are not torted or filled. It's just a 2" tall rectangle cake, iced and decorated.
Ok.. thanks guys..
I ended up make a second layer ... 
I was going to put it on top...
Attempting to tort the one layer looked a wee bit scary!
The cake is for 6 people - they wanted a square shape - but I didn't have a square pan - and the order was placed 3 days before they needed it.. so I didn't have the time.. or $ - So it was agreed to do a rectanlge cake...
Do you think I should do a one or two layer???
Hehe ok 1 layer it is..
I'm going to use the second one and make a fondant cake present!
bake the single layer 9x13, cut it in half and stack on top and cut to a square shape, dont charge less though, you still had to bake the larger cake.
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