According to market research firm iSuppli, the second-generation Apple TV may have a materials cost of less than $64. Citing iSuppli’s teardown of the device, Bloomberg BusinessWeek reports that the Apple TV’s Samsung-made A4 processor is its most expensive part at $16.55, followed by the Toshiba 8GB flash memory chip, which is estimated to cost $14. The Broadcom-sourced Wi-Fi and Bluetooth chip costs $7.65, according to iSuppli’s…