It depends on the brand of rotors as to what direction the slots are milled into the friction surfaces. You should orient your rotors based on the direction of the cooling vanes, not the slots, assuming they're directionally vaned rotors. For a directional vane rotor, the cooling vane should slope like / or ( at the top of the rotor looking at the outside face of the rotor.
Most quality rotors will run the surface slots opposite the direction of the cooling vanes so that they intersect at near perpendicular angles versus running parallel to one another and reducing the rigidity of the rotors and possibly increasing NVH.
Tobin
KORE3
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