Auto-populate email address from pc:Person?

I have a pc:Person picker used on an InfoPath form, where they look up their name in Active Directory and select it. The saved form looks like “Last, First” and that’s it. There’s no way I can see for the manager to see user it is (especially if people have the same first and last name).

How can I add another field to this that auto-populates the email address from the Person picker?

I see that AccountId is available under pc:Person which is the username, but whenever I try to drag it onto the form it forces a repeating field and I only want this field to correspond to the picked Person picker (one person).