Depending on personal preference, most people run between 1.0 and 3.0 degrees of rear toe in. Not too familiar with the TC4, but usually -2.0 degrees refers to 2 degrees of negative camber (top of tire leaned in 2.0 degrees).
People just refer to either toe in or toe out. You run toe in in the rear, and no toe to slight toe out in the front.
*** The Gate - Celebrating 7 years at the same location ***
The difference between genius and stupidity is that genius has its limits. - Albert Einstein
Understeer is when you hit the wall with the front of the car and oversteer is when you hit the wall with the rear of the car