SACD -- Hybrid, Single layer, Stereo, Multi?

The stereo SACD track is mandatory and resides on the SACD player. This is the bare minimum. You can also optionally a have a multichannel mix to the SACD layer, but this is not required. Any multichannel SACD disc will have a stereo mix. you can also optionally have a redbook CD layer (hybrid) in addition to the CD layer. Either of these two options are independent of each other.

Kr4 and Aroc -- Thanks for the info!

So basically, there are no sacds that are STRICTLY MULTICHANNEL? I've always wondered this as some of the labels on the outside will say "sacd Multi-Channel" which confuses me on this issue. I've always thought these particular discs were only multichannel and would sound terrible on my stereo setup. Am I misinformed here?

There are NO only MCH SACDs. All SACDs have a stereo track.