28 CFR Part 35 Title II Notice of Proposed Rulemaking (NPRM) (published 2008)

(4) Stadium-style movie theaters locate wheelchair seating spaces and companion seating on a riser or cross-aisle in the stadium section that satisfies at least one of the following criteria:

(i) It is located within the rear sixty percent (60%) of the seats provided in an auditorium; or

(ii) It is located within the area of an auditorium in which the vertical viewing angles (as measured to the top of the screen) are from the 40th to the 100th percentile of vertical viewing angles for all seats as ranked from the seats in the first row (1st percentile) to seats in the back row (100th percentile).