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High resolution spectropolarimetric observations of the strongly magnetic,super-slowly rotating rapidly oscillating Ap star HD166473 are used toinvestigate the implications of the presence of a variable strong magneticfield on the vertical and surface horizontal distribution of various chemicalelements. The analysis of the calculated LSD Stokes $I$ and $V$ profilesconfirms the previously reported detection of non-uniform horizontal surfacedistribution of several chemical elements. To test the vertical abundancestratification of iron peak and rare earth elements, magnetic fieldmeasurements were carried out using spectral lines of these elements belongingto neutral and ionised stages. We find clear indication of the existence of arelation between the magnetic field strength and its orientation and verticalelement stratification: magnetic field values obtained for elements indifferent stages close to the magnetic equator are rather similar whereas thedispersion in field strengths is remarkably large in the regions close tomagnetic field poles. At the phases of negative and positive extrema the meanlongitudinal field strength determined from the analysis of the REE lines isusually stronger than when using Fe and Cr. The strongest mean longitudinalmagnetic field, up to $-$4160$\pm$226 G, is detected using the La II line listat the negative extremum, followed by the measurements using the Pr III lineswith $\langle B_z \rangle$=$-$3740$\pm$343 G and the Ce II lines with $\langleB_z \rangle$=$-$3372$\pm$247 G. The strongest mean longitudinal magnetic fieldof positive polarity, up to 3584$\pm$354 G is detected using the Pr III lines,followed by the measurement $\langle B_z \rangle$=2517$\pm$249 G using the CeII lines.

The anomalous atmospheric structure of the strongly magnetic Ap star HD166473