"Copy of a" is the second single from the Nine Inch Nails album Hesitation Marks. The single was given away for free on Amazon.com for a limited time starting August 13, 2013, to anyone with a US or UK account. It was also made available to those who had pre-ordered the album from Nine Inch Nails' official online store, together with "Came Back Haunted" in a zip file labeled "Hesitation Marks Singles".