A month ago, I submitted a paper to a prestigious journal. In that paper, we proposed a general method (method A), and we proposed a set of methods for doing some work based on this method A. I now have to work on another paper, which relies on method A, which I will be submitting to a less prestigious journal. Since I need this paper to graduate (I am a PhD student), I can't wait for the first one to be accepted before submitting the second one.
I didn't find any policy regarding referencing a submitted paper in the second journal (from Elsevier).
Is it a good idea to very briefly describe the method A in the second journal paper and also reference it as a submitted paper? Method A has some proofs which I will not restate in the second paper.
This way, the reviewers will be able to do their work. Note that it is very important that I don't want to hurt the chance of acceptance of the first paper or my reputation in any way.
In other words, how can I describe a result from a submitted paper so that the reviewers can do their work?
What would you suggest for someone like me who has to submit another paper (for faster graduation) in this situation?