Can I extend my 2-month single entry visa in Thailand and return for 2 weeks with a standard 30-day stamp?

The user is seeking confirmation on whether they can extend their 2-month single entry visa for an additional 30 days, then re-enter Thailand for 2 weeks using a standard 30-day stamp. Community responses suggest that to extend the visa, the user should prepare specific documents, including a passport and a TM6 card. Additional feedback indicates that re-entry for a short duration should generally be acceptable.