Note on Griffiths 9.37

Ignore Griffith's answer to part (d) (his equations 9.203).  What he wants are the transmitted fields, but he has chosen the phase of the amplitude Eto to be zero, which is not possible in general, if the incident field amplitude has zero phase-- the usual assumption.  Your (correct) expressions will look a bit more complicated.
Proceed with (e) and (f) using the correct fields.