This printable resignation letter alludes to negative changes in the company that cause the employee's departure.
I am sorry to inform you that I must tender my resignation as (position), effective (date).
I have always enjoyed my work at (Company) and felt that I was doing much to further the field of (field). However, after recent changes within the company, I no longer feel that I am a good fit. I am happy to help out in training my replacement however I can.
Thank you for the opportunities and experiences you have offered me here at (Company).