Reviewing all the available documentation and forum activity for the AFE4300, I don't see any information on how to directly measure or calculate the Resistance and the Reactance using the AFE4300. As I understand it, the AFE4300 can measure Impedance using FWR at all frequencies and can also measure / calculate Phase Angle and Impedance at limited (8, 16, 32, 64, and 128 kHz) frequencies using IQ mode.
So how to measure Reactance and Resistance? Preferably at all frequencies as I have not come across any BIA formulas that use the IQ mode frequencies. Most use 1, 5, 50, and 100 kHz.