BASE

○ Mechanical and thermal insulation*
○ Replaces the lost dentin
○ Thickness = (0.75 mm) 1-2 mm
○ High modulus of elasticity

Order:-
(OLD CONCEPT)
LINER
VARNISH
BASE
AMALGAM

Now a days bases are more dentine n pulp friendly like GIC, so you don't need varnish below GIC. So answer the question acc to what base is used.
LINER
BASE
VARNISH
AMALGAM