I've been wondering about this for a while actually, but does anyone know what the root word is for 'Realmatics'?
Is it 'Real' or 'Realm'?
There are arguments for both:
On the one hand Realmatic theory deals with the structure of reality, so 'real'.
On the other hand, said reality is composed of the three realms, so 'realm'.
Knowing Mr. Sanderson's habits it could also a combination of the two.