Either 3 or 4 layers depending on the temperature.
For those who have been in real cold you will be familiar with the basics of this systems approach
Inner stretch glove 17 grams, wind resistant.
LW fleece glove 55 grams, highly wind resistant
Helly -Hansen pile mittens with added tricot liner, 79 grams highly breathable
US Army Arctic mitten, insulated liner and shell, 155 grams, higly wind resistant
For milder weather to about -20C
Inner stretch glove
Outdoor Research High-Camp 3-finger glove
Again the insulated Arctic Mitten shell
Like a lot of extreme cold weather mittens the US Arctic insulated liners have a double layer on the back of the palm but I may unpick a short line of stitching and add some more insulation on the back