As you are doubtless aware, the Federal Reserve has proposed for domestic implementation a range of surcharges higher, and somewhat differently calibrated, than the Basel framework.
3 The approach to calibration we developed in cooperation with other Basel Committee members was to determine the additional capital necessary to equalize the probable systemic impact from the failure of a systemically important bank, as compared to the probable systemic impact from the failure of a large, but not systemically important, bank.