Here is one of the many personalized thank yous, I sent in my many responses back and forth with interviewers. Names and locations are modified for this posting.
Dr. Al Greenwich,
Thank you for taking time out of your busy schedule to talk to me about the Duck Dogers High School, Deer in the Headlights Unified School District and the business team. I appreciate your time and consideration in interviewing me.
After speaking with you, Mr. Consonant, and Ms. Vowels, I feel I am a good candidate for your school. Our conversation reconfirmed for me how good a fit your program is. You asked about XYZ. Let me clarify...
Any additional suggestions or advice you may have would be welcome. I look forward to hearing your decision and hopefully, one day soon, will get the opportunity to work alongside you. Please feel free to contact me via email or phone.
Once again, thank you for your time and consideration.
Best wishes and regards,
My Formal Full Name
Note I only put in a clarification if I feel its needed after interviewing for something I feel I could explain better.
Also, if its handwritten, its usually only versions of the first and last paragraph.