Definitely email. Don't phone and try to "start a converstation" -- it's a courtesy thank you, not a second interview. Also, if you were interviewed by two people, it's easy to send the email to them at the same time.
Having said that, if there is a second interview, make it known that you're interested and would welcome the opportunity for a second interview. Otherwise, just be professional and concise in your email, and invite them to contact you should they have any further questions.
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