  Observational power spectra of the photospheric magnetic field turbulence, of
the quiet-sun, were presented in a recent paper by Abramenko and Yurchyshyn.
Here I focus on the power spectrum derived from the observations of the Near
InfraRed Imaging Spectrapolarimeter (NIRIS) operating at the Goode Solar
Telescope. The latter exhibits a transition from a power law with index $-1.2$
to a steeper power law with index $-2.2$, for smaller spatial scales. The
present paper presents an interpretation of this change. Furthermore, this
interpretation provides an estimate for the effective width of the turbulent
layer probed by the observations. The latter turns out to be practically equal
to the depth of the photosphere.
