Noticed that Stephen King's The Stand is going to be released on DVD-18....

Also remembered that DVD-18 was explained to me as dual sided, dual layered....while DVD-9 is single sided, dual layered....I thought I understood at the time, but (obviously not):

If you have a single sided, dual layered disc, if you flip it over and record dual layered on the other side, isn't that dual sided/dual layered?

Or do those titles currently recorded on both sides (like 'Donnie Brasco', 'Man in the Iron Mask') all dual-sided/single layered?