"Micarta is usually layers of cloth in a matrix, how do you make this using rosewood?" Most likely just micarta in layers of dyed white-wood misrepresented with the buzz-word 'rosewood' for marketing purposes. I've also seen laminated-wood pistol grips actually marketed as Coco Bolo. In both cases the buzz-words should be prefaced properly with '
FAUX'.
Such shameless marketing TRICKERY is partly why we so often see consumers misrepresenting their guns'
walnut-stained hardwood stocks as walnut; sometimes purposely, occasionally not.

Real Rosewood (Moradillo) cap on a walnut-stained hardwood stock stripped of the walnut paint to reveal the natural grain.

Rosewood (Bocote) cap on real walnut beautified with a soft-luster finish.

Real Coco Bolo on a walnut-stained hardwood stock.
Clues that the same woodworker did all three examples are the brass Phillips-head cap attachment screws, a preference for soft-luster finish rather than high-gloss, and attraction to airguns, and pistols.

Faux Coco Bolo (laminated wood) grips.