I meant 2019, and there weren't any materials that I would consider as clear and well defined as Mara's linked docs explaining the different orderings used by C

I meant 2019, and there weren't any materials that I would consider as clear and well defined as Mara's linked docs explaining the different orderings used by C, C++, and Rust (Relaxed, Release, Acquire, AcqRel, and SeqCst). I'm very sure there were discussions and teaching materials then, but none (that I was aware of) focused on Rust, and something I'd link to someone who had never heard of atomic ordering before.