What is exactly the command or the document class which is required to format a document such that it has alternating margins? Default values for margin space which are appropriate for dissertations are desired.
If you use the
report class or the koma script variants
scrreprt then you should have alternating margins by default. It is enabled using the
twoside class option and disabled using the
If you want to change the margins then you can do this e.g. using the
geometry package. It accepts the
margin=<length> option for all sides or
bottom for the separate margins. The koma script classes have their own margin settings. See its manual for the details.