35mm actually allows up to 6 tracks on full-coat, with many other varients:
I've seen one-track, 3-track, 4-track and 6-track 35mm mag-film recorders and dubbers.

I've never seen a 16mm full-coat mag-film, just 17.5mm. I'm sure 16mm exists, I'm just not sure of 
any standard formats as far as tracks. I assume single-track was definitely an option.

-- Tom Fine

----- Original Message ----- 
From: "Roderic G Stephens" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, August 19, 2010 4:32 PM
Subject: Re: [ARSCLIST] help: 16MM mag sound film

Hi Shai,
In my experience, there is usually just one track on 16mm fullcoat. 35mm fullcoat allows room and 
width for three tracks or stripes if it's been coated that way.
Rod Stephens

--- On Thu, 8/19/10, Shai Drori <[log in to unmask]> wrote:

From: Shai Drori <[log in to unmask]>
Subject: [ARSCLIST] help: 16MM mag sound film
To: [log in to unmask]
Date: Thursday, August 19, 2010, 12:49 PM

 Does anyone have information about the standard used to record audio on 16mm full coat film. A 
project came in where the audio for the film is on full coat 16mm and I wonder how many tracks could 
there be or how many formats. Any info or links will be appreciated.