Dolby Atmos: does it do anything for two-channel reproduction?

I noticed that more and more of my downloads from Apple Music show the Dolby Atmos logo next to "lossless". But I cannot really hear any obvious difference on my two-channel system. Would I need a special decoder? I don't know if there are any besides the one reviewed in the current Stereophile issue (which costs a bundle). And if I had such a decoder, would it add anything to two-channel reproduction (such as adding spatial information), or is it designed strictly for multi-channel reproduction such as home-theater?

Thanks!