i only do one layer but i use 3" pans so after icing and or filling my layer its about 21/2 to 3" anyway.
I use 2 mixes in my 2" Magic Line pan. My cake is about 2". I trim off the dome and flip it over onto my board. Turns out great.
Since a 9 x 13 x 2 is a sheet, I only use one. I either use them as a base or just a simple cake. I tort and fill so its a little bit higher than 2 inches.
One time I did one for Bob the Builder and used two sheet cake and it looked huge!!!
I'm a newbie to the forum section so I hope I am doing this right. I just recently bought the Wilton Decorator Preferred 9x13x2 pan and I use 2 cake mixes in it and I like the results. Very nicely shaped for decorating.
I have not done this with a 9 x 13 but I have done several 2-layered 11 x 15's and 12 x 18's. They turn out really nice. 
How many layers to use depends on how many servings you want
Figure 12-15 servings per cake mix. For a 9x13x2 pan I use 1 1/2 mixes (or 1 mix w/the extender recipe) so that should give you 24 servings.
If you need more servings than use 2 layers which will give you something like 48-50 servings.
A 2 layer cake should be 4" tall. You cut it into 1"x2"x4" slices.
A single layer cake (2" tall) is usually served in 2"x2"x2" pieces.
Either way it is the exact same amount of cake
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