I am not sure that efke IR has an anti halation layer. I think not. Results seem to be very special, but you have to try it (so do I). My problem with Efke is their quality control: their films have scratches and pinholes. That's a pity, cause otherwise, their are pretty good as very old fashion films.
I have to agree on the Efke quality control issues. I like this film a lot but I have had a great deal of scratches and holes on many rolls. I take great care when handling this film and I have never had these problems with any other films I have used.