A system and method for controlling deposition of thin films on substrates. A plurality of monitoring sets are retrieved from a database. Preferably, the system includes the ability to search for databases within an associated information network, such as the Internet. The digital filter is integrated with the DAC binary decoder in a memory device such as a ROM with time multiplexed output. The head rest is formed by an inflatable beaded body connected to the upper rim of the tube and extending over less than 360\xb0 to leave free a peripheral region outside the tube for free breathing.