# Fe4N and PAS

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r07043531
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I believe I posted my answer already, but it seems that I don’t have acces. Therefore, I’ll sumerise in short what I previosuly posted:

1/ Fe-I: Its three axis have 4-fold symmetry so you can choose which axis you take as the z-axis four the PAS.

2/ Fe-II(a) and (b) are the same as the have both one 4-fold symmetry axis and two 2-fold symmetry axis. All three axis can thus still be chosen as Z-axis in the PAS.

3/ Only when the 4-fold symmetry axis is chosen to be the Z-axis in PAS, eta will be zero.

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