>>4137527remjet isn't the same as anti-halation layer. almost all B&W films have an AH layer. but double X doesn't have it by default. it was designed in the 50s, and some time in the very late 90s and early 00s, they added it and then removed it due to complaints.
the roll you buy from cinestill is exactly the same as the big 1000ft rolls you buy from kodak intended for motion picture productions.