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For Fe-I we have 3 4-fold rotation axes. Each rotation axis is a line through the Fe-I you focus on and through the closest Fe-I neighbour (for example like the yellow arrow). Any of these rotation axes can be taken as the z-axis of your PAS and in this case eta will be 0.
For Fe-II we have 1 4-fold rotation axis (through the face and body center) This is the z-axis of the PAS where eta = 0.
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