In which case did the supreme court create the "immediately apparent" requirement for a valid plain view seizure?

The case was " Arizona v. Hicks".

The incident was in 1984 when police entered Hicks' apartment after a shooting injuring someone on another floor, during the search a policeman moved and recorded the serial number of stereo equipment later found was obtained in an armed robbery. The state trial court granted Hicks' motion to suppress the stereo equipment based on the motion that initial search was lawful but moving the stereo was not related to the shooting incident hence violated Fourth amendment. The Arizona Supreme Court rejected the State's request to review, but the U. S. Supreme Court agreed to do so.