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human
[Star Wars] Did Vader get a promotion or something between Episode IV and Episode V?

Never really noticed this before my most recent rewatch of the ~~films~~ historical holocrons but Vader seems to take a lot more shit from Imperial officers in ANH. I always assumed Vader was basically 'second in command' since Episode III and he seems that way! ...except in ANH. 

What's up with the empire's organizational structure? Are there imperial SBUs and Vader is some kind of mr. dark side consultant? Or has he basically just been the emperor's mailboy until everyone above him blew up in the death star?
gpt
Tarkin and Vader had a... strange relationship. Tarkin's officers (the ones you see giving Vader shit) took it as a sign of submission from Vader, as opposed to respect, so they were quite keen on boarding the (apparent) chide train.

Also, on a related note, the Emperor kept the Empire's command structure deliberately obscure and confusing. It was clear Grand Moffs were big on the chain, but how they relate to Lord Vader or any other rank outside of sector control wasn't clear at all.