Living on both sides of the Rockies, I've noticed that quite often the lenticulars that i see and recognize are usually not stacked up. Just one, big lens shaped cloud over the mountain when it's windy. From the bottom, they're quite smooth, and a little ripply. If you google around for "lenticular clouds", you'll be able to find hundreds of pictures of them.
I've noticed something else on my internet journey today as well. I found a few sites that show the development of lenticulars as they form, and usually they seem to start as one large lens shaped cloud, and then become broken up into the layer plates afterward. This could be a mistaken interpretation of the pictures, too. I don't know. If this is what happens, then WHAT causes the breakup? I don't know. hmmm... And while we're on the subject, can somebody explain rotor and cap clouds please?