This contribution reports, for what we believe is the first time, on
V
O
2
-based thin-film coatings on flexible Al substrates exhibiting a tunable positive emittance-switching
Δ
ε
=
(
ε
H
-
ε
L
)
>
0
. More precisely, a layered stack of a-
S
i
:
H
/
S
i
O
2
/
V
O
2
on flexible Al sheets presents minimum and maximum values of emissivity of about 0.18 and 0.57 at 40ºC and 83ºC, respectively, and hence allows an emittance-switching
Δ
ε
of 0.39 and a relative variation
Δ
ε
/
ε
Λ
of
∼
217
%
. Such variations fit with the potential applications of such coatings as smart radiation devices in small satellites and spacecraft.
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