Hello Hayden
r_loc defines the exponent \alpha_C of the core charge distribution. Check section 2.3 of this reference for further details. While this parameter is part of the parameter set of the GTH pseudopotentials (local part), it can be in principle arbitrarily chosen for all-electron calculations, but for reasons of computational efficiency and accuracy, r_loc should not be too small or too large. 0.5 turned out to be a reasonable choice, which should also work for At.
The atomic regions for the hard part of GAPW are defined by the HARD_EXP_RADIUS keyword key.
HTH
Matthias
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