Well, I think the easiest solution is to point domain2 itself to domain1 – set the A records of the domain to the other server you have your files on. You either have to ask your domain provider to do this, or you might be able to do it manually yourself using some kind of administrative interface. This isn’t on a HTML level, this isn’t a redirection.
All right. The problem was that I didn’t have that snippet of code at the top of the file – so WordPress didn’t recognize any page templates, and so it didn’t display that dropdown menu. No it does: thank you very much for helping.
No, it doesn’t. Thanks for the help – but I still won’t find the “Page templates box”. What is that and where is supposed to be? Thank you so much!