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Hi,

I have a unit cell of a dozen atoms, which renders one unpaired
electron in a spin-polarized calculation.

In order to find out how the unpaired spins interact with those
in neighboring unit cells (parallel or anti-parallel), I have doubled
the unit cell, and calculated everything again. Then I get two
unpaired electrons in the "doubled" system.

Now, which of the following statements are true:

1) The unpaired electrons of neighboring unit cells do
not pair up as up/down pairs.

2) This material is ferro-magnetic.

3) This material is not anti-ferro-magnetic.

Thank you for helping me understand this issue.
Rob.

please check any standard solid state physics textbook for the definition of ferromagnetic and antiferromagnetic structures!
if the total magnetic moment of the supercell is 0 though each cell carries a magnetic moment, you are in the AF state, ie the moments of neighboring cells couple as up/down (you can check the local moments to verify, set LORBIT appropriately to do so ).